Alan Fletcher and Jackie Woodburne have played Dr Karl and Susan Kennedy on Neighbours for 28 years. As you'd expect, the Ramsay Street couple have had their fair share of ups and downs, but viewers were shocked when infidelity crept into the pair's marriage.

In this heart-wrenching confrontation from 1998, Susan discovers Karl has had an illicit affair with a younger woman and gives him a resounding slap. The slap has since become infamous for its ferocity, and is considered quite camp in hindsight. Despite Karl's various lapses in faithfulness over time, the fictional marriage endured and strengthened, making Karl and Susan two of the most beloved characters in the series.

This clip is from episode 3110 of Neighbours and was broadcast on 10 June 1998.

Summary by Wendy Hanna